Hydrocarbon generation potential and organic matter accumulation patterns in organic-rich shale during the mesoproterozoic oxygenation event: evidence from the Xiamaling formation shale

Miao, Huan; Jiang, Zhenxue; Tang, Xianglu; Deng, Ze; Zhang, Chengju; Liang, Zhikai; Shi, Yuguang

doi:10.1007/s40948-023-00668-3

Cited by 3 publications

(1 citation statement)

References 99 publications

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“…The fundamental reason for the different effectiveness of seepage channels is the difference in depositional environments. , Mn, V, Cr, Mo, U, Th, and other metal elements as trace elements are affected by redox conditions, and the trace element ratios [V/Cr, Ni/Co, V/(V + Ni), etc.] can be used as a basis for judging redox conditions.…”

Section: Discussionmentioning

confidence: 99%

Characteristics and Genetic Mechanism of Effective Seepage Channels in the Tight Reservoir of the Fuyu Oil Layer in the Northern Part of the Songliao Basin

Yuan,

Tang,

Xiao

et al. 2024

Energy Fuels

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With the Fuyu oil layer in the Songliao Basin taken as the research object, this study explores the characteristics and genetic mechanism of effective seepage channels in the tight reservoir based on the identification of the characteristics of the pore–crack system and the identification of the effective seepage channels using the methods of core observation, casting thin-section observation, scanning electron microscope observation, wood alloy injection, and three-dimensional reconstruction of cores, and synthesizing the parameters of the depositional microfacies, reservoir properties, and pore–crack combination. The results showed that the seepage channels in tight reservoirs can be categorized into effective seepage channels for type I, effective seepage channels for type II, effective seepage channels for type III, and ineffective seepage channels, and their seepage capacity and their degree of development were weakened in order. The formation of effective seepage channels was influenced by the depositional environment and petrogenesis. Different types of seepage channels were formed by different diagenesis after different minerals were formed in the depositional stage.

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Section: Discussionmentioning

confidence: 99%

Characteristics and Genetic Mechanism of Effective Seepage Channels in the Tight Reservoir of the Fuyu Oil Layer in the Northern Part of the Songliao Basin

Yuan,

Tang,

Xiao

et al. 2024

Energy Fuels

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Hydrocarbon Generation Potential and Organic Matter Enrichment Mechanism of the Cambrian Marine Shale in the Tadong Low Uplift, Tarim Basin

MIAO,

WANG,

JIANG

et al. 2024

Acta Geologica Sinica (Eng)

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Cambrian shales in China and elsewhere contain abundant oil and gas resources. However, due to its deep burial and limited outcrop, there has been relatively little research conducted on it. The Cambrian shale of the Tadong low uplift in the Tarim Basin of western China, specifically the Xidashan–Xishanbulake Formation (Fm.) and overlying Moheershan Fm. provide a case study through the use of organic petrology, mineralogy, organic and elemental geochemistry, with the aim of analyzing and exploring the hydrocarbon generation potential (PG) and organic matter (OM) enrichment mechanisms within these shale formations. The results indicate that: (1) the Cambrian shale of the Tadong low uplift exhibits relatively dispersed OM that consists of vitrinite‐like macerals and solid bitumen. These formations have a higher content of quartz and are primarily composed of silica‐based lithology; (2) shale samples from the Xidashan–Xishanbulake and Moheershan formations demonstrate high total organic carbon (TOC) and low S2 content. The OM is predominantly type I and type II kerogens, indicating a high level of maturation in the wet gas period. These shales have undergone extensive hydrocarbon generation, showing characteristics of relatively poor PG; (3) the sedimentary environments of the Xidashan–Xishanbulake and Moheershan formations in the Tadong low uplift are similar. They were deposited in warm and humid climatic conditions, in oxygen‐deficient environments, with stable terrigenous inputs, high paleoproductivity, high paleosalinity, weak water‐holding capacity, and no significant hydrothermal activity; and (4) the relationship between TOC and the paleoproductivity parameter (P/Ti) is most significant in the Lower Cambrian Xidashan–Xishanbulake Fm., whereas correlation with other indicators is not evident. This suggests a productivity‐driven OM enrichment model, where input of land‐derived material was relatively small during the Middle Cambrian, and the ancient water exhibited lower salinity. A comprehensive pattern was formed under the combined control of paleoproductivity and preservation conditions. This study provides valuable guidance for oil and gas exploration in the Tarim Basin.

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Effects of the Sedimentary Environment on Organic-Rich Shale in the Intracratonic Sag of the Sichuan Basin, China

Shi,

Liu,

Zhu

et al. 2024

Applied Sciences

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The enrichment of organic matter in high-quality marine shale is generally controlled by factors such as the redox conditions of sedimentary environments, productivity levels, terrigenous input, and ancient productivity. However, the controlling effect of the sedimentary environment on organic matter enrichment in intracratonic sag is still unclear. This study takes samples from the Qiongzhusi formation shale in southern Sichuan Basin as the research object, focusing on trace elements as well as rare earth elements in different stratigraphic intervals. The provenance of the Qiongzhusi formation shale is mainly terrigenous, with sediment sources mainly consisting of sedimentary rocks and granites. The primary sedimentary environment transitions from a continental margin setting, influenced by rift-related tectonic activity and sediment influx from adjacent landmasses, to an open oceanic environment characterized by mid-ocean ridge processes and oceanic plate subduction zones. During sedimentation, saline water was present, with predominant sedimentary environments ranging from shallow water to deep water continental shelves. The shale in the study area is characterized by a higher content of silicates and a lower content of carbonate minerals. Its siliceous sources are mainly influenced by biogenic and terrigenous debris, indicating higher ancient primary productivity and representing a favorable target for shale gas exploration.

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Hydrocarbon generation potential and organic matter accumulation patterns in organic-rich shale during the mesoproterozoic oxygenation event: evidence from the Xiamaling formation shale

Cited by 3 publications

References 99 publications

Characteristics and Genetic Mechanism of Effective Seepage Channels in the Tight Reservoir of the Fuyu Oil Layer in the Northern Part of the Songliao Basin

Characteristics and Genetic Mechanism of Effective Seepage Channels in the Tight Reservoir of the Fuyu Oil Layer in the Northern Part of the Songliao Basin

Hydrocarbon Generation Potential and Organic Matter Enrichment Mechanism of the Cambrian Marine Shale in the Tadong Low Uplift, Tarim Basin

Effects of the Sedimentary Environment on Organic-Rich Shale in the Intracratonic Sag of the Sichuan Basin, China

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